U.S. Air Force Senior Airman John Phoebus, 660th Aircraft

U.S. Air Force Senior Airman John Phoebus, 660th Aircraft Maintenance Squadron aero propulsion apprentice, cleans the wheel assembly on a KC-10 Extender prior to takeoff July 11, 2019, at Travis Air Force Base, California. Under supervision, Phoebus temporarily undertook the extra responsibilities of a flying crew chief to fill a mission requirement. FCCs are responsible for a wide variety of maintenance duties while traveling with the aircraft including refueling, paperwork, routine maintenance and troubleshooting major issues. (U.S. Air Force photo by Heide Couch)